package com.sinba.common.utils;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class AES {
	 private static final String AES = "AES";   
	  
	    private static final String CRYPT_KEY = "ponshine@139play";   
	  
	    /**  
	     * 加密  
	     *   
	     * @param encryptStr  
	     * @return  
	     */  
	    public static byte[] encrypt(byte[] src, String key) throws Exception {   
	        Cipher cipher = Cipher.getInstance(AES);   
	        SecretKeySpec securekey = new SecretKeySpec(key.getBytes(), AES);   
	        cipher.init(Cipher.ENCRYPT_MODE, securekey);//设置密钥和加密形式   
	        return cipher.doFinal(src);   
	    }   
	  
	    /**  
	     * 解密  
	     *   
	     * @param decryptStr  
	     * @return  
	     * @throws Exception  
	     */  
	    public static byte[] decrypt(byte[] src, String key)  throws Exception  {   
	        Cipher cipher = Cipher.getInstance(AES);   
	        SecretKeySpec securekey = new SecretKeySpec(key.getBytes(), AES);//设置加密Key   
	        cipher.init(Cipher.DECRYPT_MODE, securekey);//设置密钥和解密形式   
	        return cipher.doFinal(src);   
	    }   
	       
	    /**  
	     * 二行制转十六进制字符串  
	     *   
	     * @param b  
	     * @return  
	     */  
	    public static String byte2hex(byte[] b) {   
	        String hs = "";   
	        String stmp = "";   
	        for (int n = 0; n < b.length; n++) {   
	            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));   
	            if (stmp.length() == 1)   
	                hs = hs + "0" + stmp;   
	            else  
	                hs = hs + stmp;   
	        }   
	        return hs.toUpperCase();   
	    }   
	  
	    public static byte[] hex2byte(byte[] b) {   
	        if ((b.length % 2) != 0)   
	            throw new IllegalArgumentException("长度不是偶数");   
	        byte[] b2 = new byte[b.length / 2];   
	        for (int n = 0; n < b.length; n += 2) {   
	            String item = new String(b, n, 2);   
	            b2[n / 2] = (byte) Integer.parseInt(item, 16);   
	        }   
	        return b2;   
	    }   
	       
	    /**  
	     * 解密  
	     *   
	     * @param data  
	     * @return  
	     * @throws Exception  
	     */  
	    public final static String decrypt(String data) {   
	        try {   
	            return new String(decrypt(hex2byte(data.getBytes()),   
	                    CRYPT_KEY));   
	        } catch (Exception e) {   
	        }   
	        return null;   
	    }   
	  
	    /**  
	     * 加密  
	     *   
	     * @param data  
	     * @return  
	     * @throws Exception  
	     */  
	    public final static String encrypt(String data) {   
	        try {   
	            return byte2hex(encrypt(data.getBytes(), CRYPT_KEY));   
	        } catch (Exception e) {   
	        }   
	        return null;   
	    }  
}
